Reddy, K.M.K.M.ReddyTheiner, W.W.TheinerWolf, H.H.Wolf2022-03-092022-03-091997https://publica.fraunhofer.de/handle/publica/329201Induction and flame hardening are standard heat treatment procedures for generating hard cases in steels, typically thicker than 1 mm. Examples are crank shafts for diesel engines or rollers used in mills. The standard technique to determine case depth is to destroy one component from a batch and metallographically study the cross section. This procedure is expensive and obviously does not assure complete coverage.enhardening depthultrasonic testing620658670conference paper